The fish black is ready! This is the base product needed for producing a whole series of gems: rubies, sapphires, emeralds, garnet, topaz, and blue sapphires.
We are nearing the end of this series of experiments. But before we wrap up with one last recipe, we want to revisit one we did before: A recipe for imitating gold from the Rasaprakāśasudhākara.
Out of all the recipes we chose, this one probably had us scratching our heads the most: The Rasaprakāśasudhākara’s second recipe for making silver. It features uncertain, and exotic materials, and an unusual method.
When Andrew and I selected recipes for this series of experiments, we favoured recipes that appeared simple. Method 14 for making silver made the cut because it was short and featured only a few ingredients: copper, brass, bronze, arsenic sulfide, and silver. Nothing too fancy.
We have arrived at the eighth, and for us, final procedure! This step is called the stimulating or kindling (dīpana) of mercury. And here is what the text (Rasahṛdayatantra, chapter 2, verse 11) tells us about this step: